I found the same problem with different sets of tubes, so I don't think that's really it... plus the Shuguang tubes were practically new when I noticed the issue. Shouldn't the amp stop working by now if I've blown a resistor? I've been searching diyaudio for a while and found a couple cases of a "singing amp", but I think the problem in those cases were the caps.

Shuguang 6CG7's? I don't think they ever made any of those.

Quote:

Originally Posted by grokit

Speaking of compact little Stax amps, what's the story on the SRD-X? It seems like a cute little package, with line-level inputs and normal and high bias output jacks.

edit:

It's just a couple of 80's automotive chip amps (read cheap 80's car stereo) tied to step up transformers. It's ok for its intended use but high end it is not. I think I have one of these incoming (can't remember half the crap I buy) so if that is the case I'll post some pics of the circuitry.

Yeah at least it's not as bad as when I let my pug into the house, the little smug rammed my desktop down with a few of the headphone jacks plugged in broken in half. I don't dare mess with my pug like Grokit did to his cat though.